Unbound breakpoint?

Hey guys,In my case,i have some questions in @theia/monaco,so i want to understand the source code through debugging,But when i set breakpoint in @theia/monaco module,the breakpoint is unbound, in other module source the breakpoint is ok; so is there something wrong i set in my launch.json? the node version is 12.14.1;the vscode version is 1.52 linux; the under screenshot show:

so anyone can give me some tips?I’ve been confused for a long time about this;thx!

What is your Theia version? We used to have a source map issue that has been resolved.

the theia version is 1.6,when i update to 1.9 ,its works. thank you for your help!!