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What is this protocl version sent in the TLS supported_versions extension?

Hi, I am inspecting TLS client hello for a simple connection using Chrome Version 85.0.4183.83 (Official Build) (64-bit). There is unexpected version labeled as "unknown" with a strange code number. I know of TLS versions and their numbers are noted in the standard. I looked at the strange version number and could not figure it out. Can anyone help me identify what is this unknown version number for? Does Chrome do this for any purpose?

This is the version:

Supported Version: Unknown (0x3a3a)

See this screenshot: