UT 34 is clearly and consistently signed as extending east the extra block. So I'll go ahead and make that change.
UT 92 however, I'm less gung ho about. HRO does indeed show it officially extends west another block, and there are signs on the ramps showing UT 92 with an arrow pointing both ways... but there is no end sign (or signage of any sort) at the intersection down the road like there is with UT 34. And
guide signage on I-15 specifically calls out UT 92 east with no mention of west.
I'm leaning towards making the change here too (since it does extend the extra block on paper and some albeit not all signage supports this), but I'll leave this open a bit if anyone has any arguments to the contrary they'd like to make.