Steps to reproduce
Windows 7, with pwsh.exe's window size set to 200x75. The width is the relevant thing. Choice of font does not seem to matter.
Edit: Also repros on openSUSE Tumbleweed in a similarly sized ssh window or konsole window.
@((
New-Object psobject | Add-Member -Passthru Foo "a`tb"
), (
New-Object psobject | Add-Member -Passthru Foo ("c`t" + 'd' * 200)
), (
New-Object psobject | Add-Member -Passthru Foo "e`tf"
)) | Format-Table -Wrap
Expected behavior

(from PS 5)
Actual behavior

Environment data
> $PSVersionTable
Name Value
---- -----
PSVersion 6.0.1
PSEdition Core
GitCommitId v6.0.1
OS Microsoft Windows 6.1.7601 S
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
and
Name Value
---- -----
PSVersion 6.0.1
PSEdition Core
GitCommitId v6.0.1
OS Linux 4.15.6-1-default #1 SMP PREEMPT Sun Feb 25 18:51:57 UTC 2018 (06f0b06)
Platform Unix
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
Removing the tab character from the first object's property (or even replacing it with 8 spaces) fixes the extra line between the rows but does not fix the strange wrapping of the long row.
Shortening the long row so that it does not need to wrap also fixes the extra line between the rows.
Steps to reproduce
Windows 7, with pwsh.exe's window size set to 200x75. The width is the relevant thing. Choice of font does not seem to matter.
Edit: Also repros on openSUSE Tumbleweed in a similarly sized ssh window or konsole window.
Expected behavior
(from PS 5)
Actual behavior
There is an extra line after the first and last element (in fact there is an extra line after every row except the one with the wrapping value)
The row that has the long value is wrapped strangely.
Environment data
and
Removing the tab character from the first object's property (or even replacing it with 8 spaces) fixes the extra line between the rows but does not fix the strange wrapping of the long row.
Shortening the long row so that it does not need to wrap also fixes the extra line between the rows.