I have this segment to translate in a Studio project:
Segment # 54 should be altered to '1e'. But only this instance of all segments with '1.'.
I could of course disable auto-propagation via the context menu, but is this enough? Will it be remembered between sessions, in a Studio project?
Auto-propagation status and alternative translations are not remembered across sessions for external projects.
Unless you want to meddle with the Auto-propagation preferences (Numbers and Non-translatables), I suggest you still manually disable auto-propagation.
You can then add a Note to self (which you will delete before the Finalize step). You can also filter all repeated and propagated segments and change their status to Approved or something, so that you don't touch them anymore during the translation phase in CTE.