Wrong character width in full-width symbol

This is my source markdown.

```
+---------+---------+---------+
| | column1 | column2 |
+:========+:=======:+:=======:+
| row1 | x | a |
+---------+---------+---------+
| row2 | ◯ | a |
+---------+---------+---------+
| row3 | ✕ | a |
+---------+---------+---------+
| row4 | あ | a |
+---------+---------+---------+
```

I got following result:

```

column1
column2

row1
x
a

row2
◯ |
a

row3
✕ |
a

row4
あ
a

```

There is a problem on the next line.

```
◯ |
```

and

```
✕ |
```

These results include `|` character.

I can modify the source markdown to get the expected result as follows.

```
+---------+---------+---------+
| | column1 | column2 |
+:========+:=======:+:=======:+
| row1 | x | a |
+---------+---------+---------+
| row2 | ◯ | a |
+---------+---------+---------+
| row3 | ✕ | a |
+---------+---------+---------+
| row4 | あ | a |
+---------+---------+---------+
```

However, it is not beautiful.

I think it's a half-width and full-width misjudgment.
`◯` and `✕` are full width character as well as `あ`.

# Command line

```
sudo docker run --rm --mount type=bind,source=$(pwd),destination=/data pandoc/core -o out.html src.md
```

# Version

```
# pandoc --version
pandoc 2.14.2
Compiled with pandoc-types 1.22, texmath 0.12.3.1, skylighting 0.11,
citeproc 0.5, ipynb 0.1.0.1
User data directory: /root/.local/share/pandoc
Copyright (C) 2006-2021 John MacFarlane. Web: https://pandoc.org
This is free software; see the source for copying conditions. There is no
warranty, not even for merchantability or fitness for a particular purpose.
```