I presume you knew of a tool where you would type in the relation number and then the tool told you whether the relation was OK?

I can roughly see there exists multiple possible ways/tools to "check" relations, and I am unsure which one you may be using.

For example, https://ra.osmsurround.org/analyzeRelation?relationId=6607037&_noCache=on says the 6607037 one is lgtm.