Affects beta and master

Steps to reproduce:

• Set OneCore Synth
• Open a browser and start say all: NVDA+downArrow

Actual behavior:

An error occurs, say all does not continue.

ERROR - synthDrivers.oneCore.OneCoreSynthDriver._callback (14:46:18.663) - Dummy-3 (3720):
Traceback (most recent call last):
  File "synthDrivers\oneCore.py", line 405, in _callback
    name, pos = marker.split(':')
ValueError: too many values to unpack (expected 2)

The string marker contains a value like: 20:1437521:18864375

Expected behavior:

No error, say-all to continue

System configuration

NVDA installed/portable/running from source:

source

NVDA version:

dev build of beta.

Windows version:

Windows 10

Name and version of other software in use when reproducing the issue:

None

Other information about your system:

None

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

Both alpha and beta builds are affected.
This is a regression since 2021.3.5

If NVDA add-ons are disabled, is your problem still occurring?

Yes

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

Yes