Cosina announced that it has discontinued the following five Voigtlander lenses:
Discontinued Voigtlander VM lenses for Leica M-mount
The ULTRON 21mm f/1.8 Aspherical was announced back in 2012. The NOKTON Vintage Line 50mm f/1.5 was announced in 2020.
Discontinued Voigtlander SE lenses for Sony E-mount
The three SE lenses were announced back in 2020 but I guess they did not sell well because they got discontinued just two years later.
Source: Cosina Japan