Having spoken to two really sympathetic Apple Techs ( R...... and D..... ) they have both indicated that the problem lies with texts OVER 120 CHARACTERS..... this appears to be true for me, for sure. All the texts appear on my Text Replacement Lists ( Settings - GENERAL - KEYBOARD - TEXT REPLACEMENT) .... however when i attempt to use them, only the SHORT ones appear and work. All the long ones which have more than 120 characters, do NOT work.
For those of you that use TEXT replacement ( AUTO TEXT on blackberry), you will know what a disaster this upgrade of ios 12.1 has been :-(
I bought a £1000 phone, only to be faced with such a nightmare. I have over 500 Text replacement codes that i use on a daily basis and I am lost without them. I actually left Blackberry when they started to have problems with their software, only to be faced with continual issues with text replacement with Apple. Some of you will remember the issue with text replacement shortcuts that were disappearing on a previous version of ios - though this was EVENTUALLY sorted out by apple eventually.( 18 months to 2 years later !) .... I am praying that they sort it out quickly.
I don't know if this is related, but i also have an issue ( even with ios 11) with Text replacements not working properly when i send a SERIES of text messages in a row.... being in the rental property business, i can easily send off 7 long property details in a text message to client. When i did this i realised that there was a LAG in sending the messages and the text replacement would often NOT WORK - i would have to switch the phone off using the side button a couple of times and then it would work.... its as if there was a RAM or buffer issue ???
Lets hope that enough people highlight this issue so that Apple will prioritise it.