Ok, Denys , I understand you have an "Master - Slave" situation. So ,you must move the call back when Master server come back.
I'm sorry ,no help for u ,but ,maybe ,use an " master - master - master -...." architecture is the fastest way to resolve the problem. :-)) .
The key of your question is "auto-clear-sql" option not functioning normally . plz double check your config ,and make sure , all servers have same option.
Yes, correct. But when you restart FS on slave, it will erase database. And option auto-clear-sql=false not working for me.