What causes this excess gold on the rim?

[augur]

After stumbling on the same error on other coins, this seems to be a consistent error/feature for this coin. It doesn't seem to affect grading as all these coins are graded PF/PR70 by NGC/PCGS

 

 

[augur]

Assuming a similar minting process as discussed in another thread, could this be a case of fractured ring dye @shortstack68? This is the 2017 £5 proof sovereign.

This coin has a unique edge as it is not higher than the coin but chamfered like a cogwheel. It seems as if the ring dye has a breakout over  a section of 10 of these cogs with 5 protrusions, 3 normal ones and another 2 protrusions. 

The first images are taken from a NGC graded coin, the last two images are from the PCGS database. The position on the NGC coins is 11 o'clock, both PCGS coins have the protrusions at 1 o'clock but the pattern is identical on all three coins. 

[SilverJacks]

Did you find out any further information on this?

If large enough, are these issues considered mint errors or just anomalies?