BeginTransaction can only be called when the connection is open error in SqLite provider

I keep getting `BeginTransaction can only be called when the connection is open` error while using SqLite provider,

How does it supposed to work? What am I doing wrong?

https://github.com/dotnetcore/EasyCaching/blob/159a9306538dcef59a714a8d17465197ba5b4417/src/EasyCaching.SQLite/Configurations/SQLiteDatabaseProvider.cs#L55

Here we create "connection pool" per ManagedThreadId. All connection by default are closed.

Here is the only place I found where connection is explicitly opened:
https://github.com/dotnetcore/EasyCaching/blob/159a9306538dcef59a714a8d17465197ba5b4417/src/EasyCaching.SQLite/DefaultSQLiteCachingProvider.cs#L93

In, asp.net core environment I frequently encounter thread switching which cause `SQLiteDatabaseProvider` not to use opened connection but to create new connection (closed). Later when `BeginTransaction` is called https://github.com/dotnetcore/EasyCaching/blob/159a9306538dcef59a714a8d17465197ba5b4417/src/EasyCaching.SQLite/DefaultSQLiteCachingProvider.cs#L251
I get `BeginTransaction can only be called when the connection is open exception`.