[ISSUE] Cryptsetup fails on boot when using option "keyfile-offset"

[ISSUE] Cryptsetup fails on boot when using option "keyfile-offset"

[Mirodin]

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New issue by Mirodin on void-packages repository

https://github.com/void-linux/void-packages/issues/32333

Description:
### System

* xuname:  Void 5.12.19_1 x86_64 AuthenticAMD notuptodate rrrrmmnFFFF
* package:  cryptsetup-2.3.6_1

### Expected behavior
When booting cryptsetup should use a keyfile starting at a specified offset of an USB stick.

### Actual behavior
On boot cryptsetup fails complaining about option `keyfile-offset` (see picture). It seems as though the option gets preceded with only one dash. Position of the option in the option string in /etc/crypttab does not matter so it is specific to this option.
![KesPyhv](https://user-images.githubusercontent.com/2410346/128341207-e5f24926-7b06-476e-bf70-15bcdbc304ad.jpg)

### Steps to reproduce the behavior
* Encrypt partition using a keyfile
* Use USB stick containing the key at an offset
* Reboot

```
#/etc/crypttab
home           UUID=XXX /dev/disk/by-id/usb-USB_Flash_Disk_YYY-0:0 luks,keyfile-offset=512,keyfile-size=512,tries=3
```