The thing that is most striking to me about your explanation is that the change was made six years ago; it seems that anyone responsible for a company's tax position and cashflow (CFO, accountant, etc) should have been planning for this between then and now. Much like the SVB panic, a great deal of this seems to be people running companies without either paying attention to things that could have a significant impact, or hiring someone who does.
They have been. Large companies have been engaging with Congress since 2019 on this, reminding them that they intended to revert this before it took effect. CFOs wrote a letter to Congress in November. https://investinamericasfuture.org/Communications/letters/