This issue may be unresolved as the phenomenon seems to have surfaced today from this end as well as the original poster's report. After scouring the forum this seems to be the closest approximation of the issue experienced & issuing an accompanying report to better help relay this circumstance as an issue, albeit seemingly resolvable.
While targeting a potential Vassal in Sturgia with the "Rolan" character, a persuasion attempt took place and the first attempt was successful. Initially a 20% chance succeeded and additional persuasion attempts were 100%. Upon sorting how much Denars to hand over for the successful pickup, the game crashed and an auto-upload of the file dumps were offered thereafter & uploaded.
Furthermore, a save had been issued prior. Upon reloading the game the character continually assumed we were amidst a persuasion attempt without initializing another persuasion attempt.
Additionally, the "Gyphor" character from the Northern Empire, also without township or settlement was targeted. That virgin-conversation with a never-before interacted-with character also shared the exact same conversation loop.
Upon final checks/troubleshooting the problem seems to have resolved itself after a complete restart of the game from it's launcher spring board but may be a tertiary or recurring factor due to other issue/s that may have caused it.
Best factoring and narrowing of issue from a user-perspective appears to be the module responsible for these interactions being affected by an unknown factor and/or element.
Is the game modded?: No/Never
Version: 1.5.6
How to Reproduce: Every single talk-attempt with any character once issue presents itself until launcher is reset.
Scene Name (if related): N/A