I haven't heard Sanders specifically doing this; but his social-media fanbase universally gave credit for the Democrat-negotiated improvements to the Senate bill to Bernie, and he wasn't even on the negotiating team. That was frustrating.
What's more frustrating is that once the bill left the Senate and was being negotiated in the House, these same individuals like all at once suddenly flipped to calling the entire bill a "betrayal by establishment dems", of course the fault of every Dem except Bernie. A bill that Sanders voted yes on before it left the Senate!