Not a clue. I haven't been able to find any explanation. Minor leagues tend to keep these things private; there are always a couple of minor leaguers on the Suspended or Restricted lists, and rarely any explanation.
Currently:
Chris Cornelius (Reading - Restricted). Has been on the Restricted List since March of last year (2022).
Konnor Ash (Clearwater - Restricted). In this case, we know why, because of public reports of his involvement in a DUI in Florida.
Jake McKenna (FCL - Restricted). Jake's been on the Restricted List since last July. Don't know why.
Rickardo Perez (FCL - Suspended). Added to Suspended List on March 15th. The roster listing suggests it's for (unpublic) number of days. No public explanation.
Joalbert Angulo (DSL White - Restricted). On the Restricted List since last July.
Jesus Polanco (DSL White - Restricted). Added to the Restricted List on February 14th.