Some commands that use register don't work as expected

"+y, ""p, "0p don't work
The commands which are used to work with vim register have some unexpected behaviours.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'INSERT' mode
2. Type two lines:
   123456
   xxx
3. In Visual Block, select 123456 and press y to yank. It supposed to go to both registers "" and "0
4. Go to begining of string xxx
5. Remove the string by using command x 3 times. Each letter is supposed to be in "" register.

Expected behavior
In 'NORMAL' mode when I use command sequence "0p, I should get sequence 123456. Instead, I get some random lines I copied before using just a standard clipboard from another program. However, command p paste expected letter "x". So this one works.

• Extension (VsCodeVim) version: 1.0.7
• VSCode version: 1.30.2
• OS: Linux CentOS 7

Additional context
Also, in Vusial Block mode, the command "+y should copy a content into system clipboard. However, ater typing +, the visual block gets changed. As such, the block is somehow inverted and selection starts from a begining of a line up to the cursor. Also next line gets selected. This is really odd.

Start by reproducing the reported Visual Block register sequences: "0p, "+y, and repeated x deletions, using the listed VSCode and extension versions if available. Trace the handling of register commands and Visual Block selection, then verify that yanking populates the expected registers, "+y updates the system clipboard without altering the selection, and "0p pastes the yanked text.