I diverted attention away from the main question by inserting information on worker’s compensation. Sorry. PayrollHRGuy pointed this out earlier.I don't think anyone has addressed what I see the OP's basic question.
No. The employee has no legal expectation for the employer to continue things like health insurance, life insurance, retirement plans and so on. IF the claim is accepted by the workers comp carrier, then ongoing medical treatment FOR THAT CONDITION ONLY will continue. But there is NO obligation for the employer to violate the plan rules for ending benefits in general.
The employee cannot collect disability benefits and workers comp both.