memory leak when using multi-user editing

hi:
We have met serious memory leak while using multi-user editing. On 4.25.4 during modify the terrain and 4.26 while copy some assets to the content folder.
during memory leak happen we can see lag and freeze in the editor. The server memory could jump up to 50GB.
anyone notice this kind of issue before?
thank you

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Same problem in 4.26.2