While single stepping in Cube, debugger disappears into an ISR and won't return

[DiBosco]

Hi,

I'm running

STM32CubeIDE

Version: 1.9.0
Build: 12015_20220302_0855

On Linux and it's started misbehaving while trying to debug while single stepping through code.

Ican get one or two steps in and it jumps off to USART3_IRQHandler and won't come back out to where it was. This never used to happen and I'm pretty sure I've not updated the IDE!

Anyone else seen this and know how to fix it please?

Thanks!

(FWIW am debugging an F429)