private void handleAlreadyInvalidEntry(EntryEventImpl event, LocalRegion owner, RegionEntry re) {
    if (logger.isDebugEnabled()) {
      logger.debug("Invalidate: Entry already invalid: '{}'", event.getKey());
    }
    processVersionTag(re, event);
    if (owner.getConcurrencyChecksEnabled() && event.hasValidVersionTag()) {
      // notify clients so they can update their version stamps
      event.invokeCallbacks(owner, true, true);
    }
  }
If an entry is already invalid we still want to perform a conflict check, update
the entry's version stamp and invoke listeners.
geode-core/src/main/java/org/apache/geode/internal/cache/AbstractRegionMap.java