I also had the same problems with the Barker TPIR channel on Pluto, watching on a Fire TV stick. I discovered that this channel is no longer exclusive to Pluto; it's on Xumo (and others?), where it seems to play without the problems. There's even a new version of the "Bob Barker Shuffle" promo without all the CGI'd "Pluto"s.
The downside to watching Barker TPIR on Xumo, at least here, is that virtually none of the available ad inventory is sold, so the blue-screen TPIR interlude music pops up at almost every ad break. (And when there *is* an ad, it's often bafflingly out-of-market, such as election ads for a candidate not even in this state.)