“wrangler pages functions build” yields output with different filenames

I'm building my Pages' functions with the following command
wrangler pages functions build ./functions --sourcemap --compatibility-flags=nodejs_compat --outdir=./dist-functions/

Its output is either
index.js
  • index.js.map
    or
    _worker.js
    • worker.js.map
hy is that?
How can I ensure it's output is the same all the time?
How can I make it always be _worker.js
  • worker.js.map?
rangler version: 3.28.2

I tried to use --outfile option instead of --outdir , but in this case the sourcemap stops generating.
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