ADSL2 bridge to tplink + mikrotik with PPPoE client: the Internet suddenly stopped working in conjunction, it only works directly from a PC. CONSPIRACY?

Question

network hardware

Prov changed the connection to PPPoE, before that there was a stupidly stable LAN behind NAT + DCHP, for two months it somehow worked already on PPPoE , sometimes with breaks, but it worked. The internet has been down since yesterday morning. A couple of other subscribers of Provo allegedly have the Internet, but neither I nor they know through what and how they get out =)
The modem is in bridge mode.
It turned out that without a router, it’s stupid if you raise PPP from a PC, everything is OK, the traffic is chasing, if I raise a PPPoE server from a microtic, the server accepts the connection immediately, connected, but there is no way out through the router to the outside. But at the same time, the route from the router works from the router, it does not work from the PC through it.
The provider in response says "but it works directly through the modem - what questions can I have" =\
I did not touch NAT on the router, it has been configured there for 2 years and everything worked, but now it does not want to be friends with PPPoE.
Therefore, vague doubts torment me, didn’t I try it, for example, it considers the hopes of packets that one client is one PC (without NAT)? I put another Mikrotik, with a configuration from another PPPoe, the same rake. All firmware is new. In general, what could it be? Theories, sir