diff --git a/src/utilities/sequence-editor/from-seq-json.test.ts b/src/utilities/sequence-editor/from-seq-json.test.ts
index 68736f4fb8..7f070554cd 100644
--- a/src/utilities/sequence-editor/from-seq-json.test.ts
+++ b/src/utilities/sequence-editor/from-seq-json.test.ts
@@ -461,19 +461,19 @@ C FSW_CMD_2 10 "ENUM" # fsw cmd 2 description
           description: 'immediate command',
           metadata: {},
           stem: 'IC',
-          type: 'command',
+          type: 'immediate_command',
         },
         {
           args: [],
           stem: 'IC2',
-          type: 'command',
+          type: 'immediate_command',
         },
         {
           args: [],
           description: 'noop command, no arguments',
           metadata: { processor: 'VC1A' },
           stem: 'NOOP',
-          type: 'command',
+          type: 'immediate_command',
         },
         {
           args: [
@@ -487,12 +487,12 @@ C FSW_CMD_2 10 "ENUM" # fsw cmd 2 description
             Key: 'Value',
           },
           sequence: 'seqA',
-          type: 'load',
+          type: 'immediate_load',
         },
         {
           description: 'description',
           sequence: 'seqB',
-          type: 'activate',
+          type: 'immediate_activate',
         },
       ],
       metadata: {},
diff --git a/src/utilities/sequence-editor/from-seq-json.ts b/src/utilities/sequence-editor/from-seq-json.ts
index 160764e128..aa0540cff8 100644
--- a/src/utilities/sequence-editor/from-seq-json.ts
+++ b/src/utilities/sequence-editor/from-seq-json.ts
@@ -208,20 +208,20 @@ export async function seqJsonToSequence(input: string | null): Promise<string> {
     if (seqJson.immediate_commands) {
       sequence.push(`\n`);
       sequence.push(`@IMMEDIATE\n`);
-      for (const rtc of seqJson.immediate_commands) {
-        switch (rtc.type) {
-          case 'command': {
+      for (const realTimeCommand of seqJson.immediate_commands) {
+        switch (realTimeCommand.type) {
+          case 'immediate_command': {
             // FSW Commands
-            sequence.push(commandToString(rtc));
+            sequence.push(commandToString(realTimeCommand));
             break;
           }
-          case 'activate':
-          case 'load': {
-            sequence.push(loadOrActivateToString(rtc));
+          case 'immediate_activate':
+          case 'immediate_load': {
+            sequence.push(loadOrActivateToString(realTimeCommand));
             break;
           }
           default: {
-            throw new Error(`Invalid immediate command type ${rtc.type}`);
+            throw new Error(`Invalid immediate command type ${realTimeCommand.type}`);
           }
         }
       }
@@ -257,13 +257,23 @@ export async function seqJsonToSequence(input: string | null): Promise<string> {
   return sequence.join('');
 }
 
+function isCommand(step: Command | ImmediateFswCommand): step is Command {
+  return (step as Command).time !== undefined;
+}
+
 function commandToString(step: Command | ImmediateFswCommand): string {
-  const time = 'time' in step ? `${seqJsonTimeToSequence(step.time)} ` : '';
   const args = seqJsonArgsToSequence(step.args);
   const metadata = step.metadata ? seqJsonMetadataToSequence(step.metadata) : '';
-  const models = 'models' in step ? (step.models ? seqJsonModelsToSequence(step.models) : '') : '';
   const description = step.description ? seqJsonDescriptionToSequence(step.description) : '';
 
+  // used for commands, ImmediateFswCommand doesn't support 'time' and 'models'
+  let time = '';
+  let models = '';
+  if (isCommand(step)) {
+    time = step.time ? `${seqJsonTimeToSequence(step.time)} ` : '';
+    models = step.models ? (step.models ? seqJsonModelsToSequence(step.models) : '') : '';
+  }
+
   let commandString = `${time}${step.stem}${args}${description}`;
   // add a new line if on doesn't exit at the end of the commandString
   if (!commandString.endsWith('\n')) {
@@ -275,14 +285,25 @@ function commandToString(step: Command | ImmediateFswCommand): string {
 }
 
 function loadOrActivateToString(step: Activate | Load | ImmediateActivate | ImmediateLoad) {
-  const time = 'time' in step ? `${seqJsonTimeToSequence(step.time)} ` : '';
+  const time = (step as Activate | Load).time ? `${seqJsonTimeToSequence((step as Activate | Load).time)} ` : '';
   const args = step.args ? seqJsonArgsToSequence(step.args) : '';
   const metadata = step.metadata ? seqJsonMetadataToSequence(step.metadata) : '';
   const models = step.models ? seqJsonModelsToSequence(step.models) : '';
   const engine = step.engine !== undefined ? `@ENGINE ${step.engine.toString(10)}\n` : '';
   const epoch = step.epoch !== undefined ? `@EPOCH ${quoteEscape(step.epoch)}\n` : '';
   const description = step.description ? seqJsonDescriptionToSequence(step.description) : '';
-  const stepType = `@${step.type === 'activate' ? 'ACTIVATE' : 'LOAD'}(${quoteEscape(step.sequence)})`;
+  let stepType = '';
+  switch (step.type) {
+    case 'activate':
+    case 'immediate_activate':
+      stepType = '@ACTIVATE';
+      break;
+    case 'load':
+    case 'immediate_load':
+      stepType = '@LOAD';
+      break;
+  }
+  stepType += `(${quoteEscape(step.sequence)})`;
   let stepString = `${time}${stepType}${args}${description}`;
   if (!stepString.endsWith('\n')) {
     stepString += '\n';