This affects mostly SQL++ queries, but affects some limited QueryBuilder cases as well. Most query operations are DB exclusive and need to lock as such, but the SQL++ queries were merely locking on their own instance locks.
Build couchbase-lite-net-3.1.9-3 contains couchbase-lite-net commit 9021941 with commit message: : Queries need to use database lock for most operations (#1652)
Fixed
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This affects mostly SQL++ queries, but affects some limited QueryBuilder cases as well. Most query operations are DB exclusive and need to lock as such, but the SQL++ queries were merely locking on their own instance locks.