The good news.
I have determined that the cause of error 500 is the HTML block ID 228. It doesn’t open in Elementor with error 500. I do not know what is in this block and do not understand the meaning of installing it in the description section of each brand. Perhaps this is an outdated element that causes a conflict with modern software.
As for the Color variation, WooCommerce has created simple products, not variable ones. I specified the settings as for a variable product – and the Color attribute began to appear as expected.
To summarize, the reason for error 500 is contained in the HTML block ID 228. This should not have negative consequences for the entire site. I don’t need this block, so I’ll just delete it and be done with it.
At the same time, I suggest you adjust the demo content and exclude the problematic element from it.
