Yea there is a large gap in understanding of glyphosate’s roll in our food systems. Also maybe I am wrong but pretty sure with the UK in particular they still have roundup being used till 2025, but I could be misinterpreting it.

Lastly glyphosate is actually tied up or immobilized the second it hits the soil, by a process called adsorption by adhering to the soil collides. Now granted minerals in your soil profile play a huge roll in that. Basically what I am saying is between natural process chemistry and soil biome of fungi etc etc, you should see little to none left on a molecular scale. So if your seeing what you are suspecting is glyphosate damage in your compost you need to call your local county extension agent(if in the US) and get that tested and sent in since it would be a very clear outlier and extreme example that should be documented and traced. Probability would suggest another culprit to be honest.