VS Code DAP does not bind TypeScript breakpoints from sourcemaps

[roms751]

Using GraalVM DAP with embedded GraalJS, VS Code attaches correctly and JavaScript breakpoints work, but TypeScript breakpoints do not bind from sourcemaps.

What works:

• VS Code attaches through DAP
• execution stops correctly
• breakpoints in generated .js files work
• sourcemaps are generated and referenced correctly
• the same sourcemaps work in Chrome DevTools

What does not work:

• breakpoints in original .ts files remain unbound in VS Code

Environment:

GraalVM 25.0.2
embedded Java application using org.graalvm.polyglot.Context
GraalJS started with DAP
VS Code attached through DAP

Question:
Is TypeScript breakpoint binding from sourcemaps expected to work in VS Code via GraalVM DAP?