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sh is not the same as bash, so either use:
bash test.sh
or
./test.sh
To be able to execute the latter command you need to make the script executable first using chmod.

bash provides many functionalities that sh does not, for instance "process substitution" that you use in your code sample.
You need to output to two files, and paste those, or you need to play dirty...

Don't know if it's relevant, but in his sample in post #1 the requestor had input line 3 printed before input line 2, which any proposal so far ignored, and even the R. did not insist upon in his...

Set OFS as well and try:
awk 'BEGIN{c=0;FS="\t";OFS="\t"}{c++}c<3{ORS=FS}c==3{ORS=RS;c=0}1' file

Here are three different awk scripts to do this making different assumptions about the number of columns/row, and width of columns. If you input data is always less that 8 output columns per input...

awk 'BEGIN{c=0}{c++}c<3{ORS=FS}c==3{ORS=RS;c=0}1' filename
If you want the results to be tab separated, then try:
awk 'BEGIN{c=0;FS="\t"}{c++}c<3{ORS=FS}c==3{ORS=RS;c=0}1' file
Note: Use nawk...