Snowflake spikes in June 2022

I was checking bridge usage in different countries on metrics.tpo, and I noticed that in many countries there is a weird snowflake spike on 2022-06-04, for example:

• https://metrics.torproject.org/userstats-bridge-combined.html?start=2022-05-29&end=2022-06-22&country=af
• https://metrics.torproject.org/userstats-bridge-combined.html?start=2022-05-29&end=2022-06-22&country=br
• https://metrics.torproject.org/userstats-bridge-combined.html?start=2022-05-29&end=2022-06-22&country=at (and many other countries)

Probably a bug? Should we remove it from the timeline?