As far as I can tell, the original quote given in all other sources is 至於桑野，是謂晏食。至於衡陽，是謂隅中。What is the reason that 至 is here written as ⿰至竟? Is this a weird mistake, or is there some reason for writing it this way.

It is shown as 次於桑野,是謂晏食。臻於衡陽, 是謂隅中。in the source below.

续博物志疏证（子海精华编）
作者：(宋）李石， （清）陈逢衡， 疏证， 唐子恒

https://books.google.co.jp/books?id=asapDwAAQBAJ&pg=PT30&lpg=PT30&dq=%E8%87%B3%E6%96%BC%E6%A1%91%E9%87%8E%EF%BC%8C%E6%98%AF%E8%AC%82%E6%99%8F%E9%A3%9F%E3%80%82%E8%87%B3%E6%96%BC%E8%A1%A1%E9%99%BD%EF%BC%8C%E6%98%AF%E8%AC%82%E9%9A%85%E4%B8%AD&source=bl&ots=D2HvG_zwUD&sig=ACfU3U3fZuWA9H4vio8qRdZLxhZqo_RoGw&hl=zh-CN&sa=X&ved=2ahUKEwiukuekvYr9AhUKB4gKHcpTB_YQ6AF6BAgYEAM#v=onepage&q=%E8%87%B3%E6%96%BC%E6%A1%91%E9%87%8E%EF%BC%8C%E6%98%AF%E8%AC%82%E6%99%8F%E9%A3%9F%E3%80%82%E8%87%B3%E6%96%BC%E8%A1%A1%E9%99%BD%EF%BC%8C%E6%98%AF%E8%AC%82%E9%9A%85%E4%B8%AD&f=false

The original evidence is a quote to 淮南子. Here is search results of "於衡陽是謂隅中" in 爱如生中国基本古籍库:



Among the 21 evidences, 2 of them give 臻 and the others give 至.

Suggest pending more evidences.

No more evidence, withdraw.