I have a bit of an idea on the development cycle of a game engine and products built on top of it - which maybe you don't - but these kind of bugs should have been ironed out a long time before they were starting to implement detailed game levels, class systems, replacing placeholder sound samples with the final ones, etc. etc.
TBH I'm not that impressed with what I see in the beta aside from the sound design which is top notch, graphically theres some impressive stuff but theres also a fair amount of ropey stuff but thats better left to judge from the proper game. There are 100s and 100s of texture issues (textures not aligned properly, flat poor quality textures used for bricks, stones, tiles, sandbags, etc.), player animations are mostly cack the death animations are especially lolarific. But none of that bothers me that much as those kinda issues can be sorted relatively painlessly - tho I still wouldn't expect them to be so prevelant in a public beta build - even one a couple of months old - this close to release. What bothers me are the bugs which indicate serious underlying issues with the game engine itself, problems in many core sub-systems that the rest is built on top of and issues here not sorted before you start fleshing out the product your building on top of it have far more complex repercussions and a whole chain of things need to be fixed and or tested against when you fix the underlying issues. These kind of issues should not be in a beta build released this close to the full game release it makes no sense to show off to the world how buggy your game is when there should be much more polished beta builds by now.