Assertion !FileSystem::Get(db).FileExists(GetWALPath()) failed

[jhpratt]

buffdb: crate-location/target/debug/build/libduckdb-sys-2e3bca8a7143e85a/out/duckdb/src/storage/storage_manager.cpp:66: int64_t duckdb::StorageManager::GetWALSize(): Assertion `!FileSystem::Get(db).FileExists(GetWALPath())' failed.
[1]    1934602 IOT instruction (core dumped)  cargo run --all-features -- run

This occurs after I insert data and then immediately try to fetch it back. The two queries are executed over the same connection (but plausibly different threads). Adding a nontrivial delay helps but very much does not guarantee success.

The error is not reliable; I'd estimate it occurs roughly half of the time. Even when this error does not occur, the newly-inserted row is not found nearly every time. Manual verification after the fact confirms that the row was inserted. DuckDB also tries to read out of bounds:

DuckDB failure: Error code 1: Unknown error code Some("IO Error: Could not read enough bytes from file \\"store.db\\": attempted to read 262144 bytes from location 1060864")

I have not the slightest clue if these are related. I am happy to split these out into separate issues if preferred. The queries being executed are as simple as they get, so I've no idea what's going on.