CR306010 (Activity): InsufficientExecutionStackException

Environment

• Acumatica 26.100.0175, Customizations: None (reproduces on a clean instance)
• Screen: Activity, type Chat (CR306010), new unsaved record
• User: admin, tenant Company, branch Products Wholesale

Steps to reproduce

1. Open a new Activity (Work Item) on CR306010. 
2. Make sure Track Time and Costs is selected and Started On is filled in by default (11/12/2026 3:01 AM) in my case.
3. Click the Completed On date field: im populateing with 11/12/2026, time defaults to 12:00 AM.
4. In the Completed On time field, enter the same time as in Started On (3:01 AM). Value should be <= startdate 

Actual result

• An error appears: Error: Unhandled exception has occurred, your changes have been rolled back: Insufficient stack to continue executing the program safely. This can happen from having too many functions on the call stack or function on the stack using too much stack space.
• The entered value is rolled back: the Completed On time returns to 12:00 AM.
• Trace for the UpdateRecords request (11:01:50 UTC) shows 10 exceptions: 8 System.InsufficientExecutionStackException entries (some with Count 2–4) and 2 PX.Data.SessionRollback+PXSessionRollbackException entries.

FYI, this is present in all versions i think. tested on 25r2, 26r1-2