I can confirm that the issue I reported no longer happens once I updated to version 25.5.31.2363. This appears to have been an isolated, transient issue in version 25.4.17.2256 for whatever reason.
@Tut, thank you for the great explanation about how the Billable expenses works (and yes, I did indeed rename the account to Reimbursable expenses in the Chart of Accounts). I’ll need time to fully absorb the accounting magic, but the proper Manager workflow for expenses have long been a challenge for me. As a one-person, pass-through consulting operation, should I be recording my reimbursable expenses as Payments rather than as Expense Claims?