Multiple studies demonstrate that RNA polymerases predictably undergo transcriptional slippage or inaccurate synthesis when encountering repetitive sequences and homopolymeric stretches.
The retrieved papers consistently report that RNA polymerases across various organisms and viruses predictably experience transcriptional slippage (indels) when transcribing repetitive sequences and homopolymeric runs. No papers refute this phenomenon; instead, they detail its mechanisms, predictability, and biological consequences. Therefore, the verdict is SUPPORTED.