ppkarwasz opened a new pull request, #3802:
URL: https://github.com/apache/logging-log4j2/pull/3802

   This change disables the sharing of formatted timestamps between threads in 
`InstantPatternThreadLocalCachedFormatter`.
   
   Previously, a mutable `StringBuilder` was shared across threads via a cached 
object. This could lead to situations where one thread ("owner") was modifying 
the builder while another thread was reading from it, resulting in inaccurate 
or truncated timestamps.
   
   This fix ensures that only thread-local instances are used, preventing 
concurrency issues and improving timestamp correctness under load.
   
   This change is similar in nature to #1485 and fixes #3792.
   


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