You're describing a system in which the HR bot is worse than useless.
Well, it was worse than useless as described in the premise by someone else as spitting out verifiably wrong information.
If a company intends an HR bot to be relied on by employees, then its words should be legally binding.
No company would would intend this, and it would be fun to see this "legally binding" status tested, because as my previous post and sibling comment lays out, it would be pretty hard to construct a plausible situation where a reasonable person believes it to be.
I think there are people who feel that if something is "legally binding" its a simple binary situation. "Well the BOT said that so clearly its binding!" and have no idea that almost no legal issue is that simple.
Like you pointed out, by preponderance of evidence, you could show that the employee should've reasonably understood they had "X" amount of days since its documented in so many different places and if one place said it was "XY" and employee decided to follow XY instead of X, they're fine since it was "legal binding". However, that would most likely not hold up in court because you can't use ignorance as a defense and say you the only vacation amount you knew of was what the BOT told you.
I think any employment attorney would inform their client this is what would happen and probably wouldn't take the case since the likelihood of winning would be so low.
Well, it was worse than useless as described in the premise by someone else as spitting out verifiably wrong information.
If a company intends an HR bot to be relied on by employees, then its words should be legally binding.
No company would would intend this, and it would be fun to see this "legally binding" status tested, because as my previous post and sibling comment lays out, it would be pretty hard to construct a plausible situation where a reasonable person believes it to be.