Calling function from another snippet breaks snippet that it is called from

I made 2 simple snippets:

SnippetA:

error_log("snip AAA");
function snipA(){
error_log("snipA()");
}
snipA();

SnippetB:

error_log("snip BBB");
function snipB(){
error_log("snipB()");
}
snipB();
snipA();

After last line added call to snipA() in SnippetB. Then it broke SnippetA.

When I return to snippetA and try to do save it tells me:

Could not create snippet. Request failed with status code 500

Any idea what is wrong? Paradoxically calling to snipA() works. So it looks like calling functions from another snippets is OK. But then it breaks SnippetA (the one who defines function that is called from other snippet…).

Any idea what is wrong?

Is it a bug?

Will it be fixed?

Thx