Hi,
If my memory doesn't go wrong, it seems this is a known issue in the era of SCOM 2012 R2 and the fix is to apply the rollup. You may apply the rollup to see if it helps. The latest version of SCOM is: Update Rollup 2 for SCOM 2019 (build number: 10.19.10407.0)
https://support.microsoft.com/en-us/help/4558752
Regards
Alex
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