Regression: ambiguous identifier

Description

This is a minimized, self-contained example of a code that works with Nim 2.0.6 and Nim 1.6.20, but it fails with Nim devel:

{.pragma: callback, gcsafe, raises: [].}

type
  DataProc* = proc(val: openArray[byte]) {.callback.}
  GetProc = proc (db: RootRef, key: openArray[byte], onData: DataProc): bool {.nimcall, callback.}
  KvStoreRef* = ref object
    obj: RootRef
    getProc: GetProc

template get(dbParam: KvStoreRef, key: openArray[byte], onData: untyped): bool =
  let db = dbParam
  db.getProc(db.obj, key, onData)

func decode(input: openArray[byte], maxSize = 128): seq[byte] =
  @[]

proc getSnappySSZ(db: KvStoreRef, key: openArray[byte]): string =
  var status = "not found"
  proc decode(data: openArray[byte]) =
    status =
      if true: "found"
      else: "corrupted"
  discard db.get(key, decode)
  status

var ksr: KvStoreRef
var k = [byte(1), 2, 3, 4, 5]

proc foo(): string =
  getSnappySSZ(ksr, toOpenArray(k, 1, 3))

echo foo()

git bisect shows commit 5f9038a5d, i.e. PR https://github.com/nim-lang/Nim/pull/22716 as a first failing commit. (ping @metagn)

Nim Version

git hash: 646bd99d461469f08e656f92ae278d6695b35778 active boot switches: -d:release

Current Output

Error: ambiguous identifier 'decode' -- use one of the following:
  getSnappySSZ.decode: proc (data: openArray[byte]){.closure, noSideEffect, gcsafe.}
  filename.decode: proc (input: openArray[byte], maxSize: int): seq[byte]{.noSideEffect, gcsafe.}

Expected Output

compiles

Possible Solution

No response

Additional Information