Watch the drive capability of parts you are connecting. If I recall from the datasheet they must have 2mA drive to overcome the TXS0108 output to change it to an input. I was using a Maxim temp converter chip and the MISO line couldn't switch the line to an input:
In the TXB0108 issue it says:
8.3.2 Input Driver Requirements
Typical IIN vs VIN characteristics of the TXB0108 are shown in Figure 6. For proper operation, the device driving
the data I/Os of the TXB0108 must have drive strength of at least ±2 mA.
TXS0108 puts it differently:
8.3.2 Input Driver Requirements
The continuous DC-current sinking capability is determined by the external system-level open-drain (or push-pull)
drivers that are interfaced to the TXS0108E I/O pins. Because the high bandwidth of these bidirectional I/O
circuits is used to facilitate this fast change from an input to an output and an output to an input, they have a
modest DC-current sourcing capability of hundreds of micro-amperes, as determined by the internal pull-up
resistors.
The fall time (tfA, tfB) of a signal depends on the edge-rate and output impedance of the external device driving
TXS0108E data I/Os, as well as the capacitive loading on the data lines.
Similarly, the tPHL and maximum data rates also depend on the output impedance of the external driver. The
values for tfA, tfB, tPHL, and maximum data rates in the data sheet assume that the output impedance of the
external driver is less than 50 Ω.