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I checkted fullwidth characters in some terminal emulators

Test command
% printf "ＡＢＣＤＥ\e[7DＦＧ\n"

Result of Mac Terminal.app, VSCode terminal, Alacritty, I assume this result to be correct.
Ａ ＦＧ Ｅ
Result of iTerm2
Ａ ＦＧＥ # \x20 is displayed in fullwidth size, maybe bug

For gem-vterm, the result is similar to most of the other terminal emulators

require 'vterm'
vterm = VTerm.new(24, 80)
vterm.set_utf8(true)
screen = vterm.screen
screen.reset(true)
vterm.write "ＡＢＣＤＥ\e[7DＦＧ\n"
12.times.map { screen.cell_at(0,_1).char }
# => ["Ａ", nil, "Ｂ", "Ｆ", nil, "Ｇ", nil, nil, "Ｅ", nil, "", ""]

Ａ Ｆ Ｇ Ｅ are rendered in correct position. Ｂ is remained in col 3 and this might be a bug of vterm.

For yamatanooroti, the result is a little different. it simply concats these chars and gets the result

require 'yamatanooroti'
include Yamatanooroti::VTermTestCaseModule
start_terminal(24, 80, 'sh')
write %(printf "ＡＢＣＤＥ\\e[7DＦＧ\\n"\n)
puts result

sh-3.2$ printf "ＡＢＣＤＥ\e[7DＦＧ\n"
ＡＢＦＧＥ
sh-3.2$

This is making reline's test hard (example: fullwidth chars with dialog test)