[BUG] Match-V5 Timeline Frames no longer evenly spaced by 1 minute. All gametime stats impacted.

[GXJackJ]

Bug Description
The Match V5 Timeline API is returning inconsistent in-game time gaps between frames, rather than being stable at 60,000MS per frame. This means each frame no longer represents 1 minute of game time.

Expected Result
Prior to Patch 16.1, the Match V5 Timeline API would return frames that were consistently spaced by 60,000MS between each frame, equating to data every 1 minute. The data is now returning with increasing sporadic gaps between each frame.

For example: EUW1_7675683750. The variance between each frames game time seems randomly distributed between 60,563MS and 71,320MS.

Developer Impact
The timeline data no longer represents evenly spaced 1-minute of game data. This means comparing two matches is impossible, since for one game the 10th frame could be the 10th minute, whilst another could be the 11th minute.

• Frequency: Every API call, some with larger gaps than other.
• Severity: All statistics relating to game time are now incorrect

Repro Steps

Call this API:

https://europe.api.riotgames.com/lol/match/v5/matches/EUW1_7675683750/timeline?api_key=[API_KEY]

Check the timestamp value for each frame in info/frames

This is impacting every stat site that reports any statistic reported by game time. For example, Gold/XP by N minutes.