Gutenberg adds spaces when I paste content

Hi, I have a problem.

1. When I copy content from one block to another in Gutenberg editor it adds backspaces before and after copied content.

For example, I have a paragraph “Best locations in Paris.”

If I copy “in Paris” to another paragraph, I get: “Best restaurants in Paris .”

Problem disappears if I copy content from page visible to visitors. Then no backspaces are added.

2. When I copy multiple blocks in editor it inserts empty rows in Classic editor before and after copied content.

For example, I copy:
Header2
Paragraph1

When I paste I get:

Empty row in Classic editor
Header2
Paragraph1
Empty row in Classic editor