Is the alternate version of Tashahhud valid or a Bidah?

In Tashahhud, Muslims say: > ٱلتَّحِيَّاتُ لِلَّٰهِ وَٱلصَّلَوَاتُ وَٱلطَّيِّبَاتُ، ٱلسَّلَامُ > عَلَيْكَ أَيُّهَا ٱلنَّبِيُّ وَرَحْمَةُ ٱللَّٰهِ وَبَرَكَاتُهُ But recently, I've found out, there are some Muslims who pray like so: > التَّحِيَّاتُ لِلَّهِ وَالصَّلَوَاتُ وَالطَّيِّبَاتُ السَّلَامُ عَلَى > النَّبِيُّ وَرَحْمَةُ اللَّهِ وَبَرَكَاتُهُ Now, I am aware of the saying in which the 2nd supplication is mentioned where a companion is saying (paraphrasing): > When Prophet was alive, we used to pray the 1st supplication and when > he died, we changed it to the 2nd supplication. According to my knowledge, none of the 4 Imams has used the 2nd supplication & it was neither taught by the Prophet himself! Also, I don't think any big scholar like Nawawi, Ibn Hajar etc has allowed the 2nd supplication! Question: --- Is there anyone before 18th century who has used the saying of the companion (above) as a Hujja to use 2nd supplication in prayer? Anyone from the Salaf? Or any big scholar? If so, please provide authentic evidence... Thanks.