Recently had a customer where the PC would install windows via MDT but Litetouch would never appear to install the applications

A closer look and we deployed a new AV Sentinelone which did not like the LTIBootstrap.vbs script

I changed the deployment of SentinelOne  to after MDT had finished and it fixed it

You might need to disable it from Deploying it to GPO as well

Also check the the bootstrap file was missing from the MDT share