Players can swim through 1x1 tunnels without water (crawling?)

If you dig a 1x1 tunnel while you are on flowing water, you can swim without any water. This is not the official"crawling feature" that was added on the Java Edition. Yes, crawling is a feature on Java Edition but don't get me wrong, it wasn't added yet to the Bedrock Edition.

How to Reproduce
1. Find a river
2. Dig a 1x1 tunnel
3. block the flowing water with any block.