[GNC] Counter formats not saving

I am using Gnucash 3.4 on OSX 10.14.2. I am creating a new book and trying to set up the invoice counter to use I-%05li as the format. If I add this definition, click Apply and switch to another tab and back, the new format appears as it should in the Invoice Number Format text field. But if

[GNC] Counter formats not saving

I am using Gnucash 3.4 on OSX 10.14.2. I am creating a new book and trying to set up the invoice counter to use I-%05li as the format. If I click Apply and switch to another tab and back, the new format appears as it should in the Invoice Number Format text field. But if I click OK, the field