They will absolutely merge in fixes, though they may well not be timely if they're not from internal engineers. I've had broken behaviour sit in a PR for over 6 months before.
Recently watched Angular Material first dismiss a glaring problem with datepicker, then sit on their hands [0] while some bloke made a complete fix, adjusting anything they brought up, then sit on their hands again [1] after it was finished until someone started building pressure again.
[0][1]: I didn't actually verify that. They might have had some really busy days. Point is they stuck to Google communication policy: try to not say anything at all.
Recently watched Angular Material first dismiss a glaring problem with datepicker, then sit on their hands [0] while some bloke made a complete fix, adjusting anything they brought up, then sit on their hands again [1] after it was finished until someone started building pressure again.
[0][1]: I didn't actually verify that. They might have had some really busy days. Point is they stuck to Google communication policy: try to not say anything at all.